It is depressing, but it's sooo incredibly good!! I watched half the first season, couldn't bring myself to watch after story. Completed Nagisa's story in the visual novel, couldn't bring myself to go on, but I'm still hooked on this series!! It's werid though because it's like the Canadian government. I'm at a complete deadlock with no progression!!SomeLameStuff said:11 Eyes is one. Don't be fooled by the awesome opening like I was! Its crap.
Also, avoid Clannad and Clannad After Story like the PLAGUE. Avoid it!
So...
Incredibly...
DEPRESSING!
On Topic:
Avoid: Zero no tsukaima - huge cash cow, I don't even know why they made this
Toradora - just stereotypical... bad
Shakugan no Shanna - this one is more personal opinion, it just seemed a bit childish and the plot is mostly forgettable.